Example

<a-scene><a-assets><a-asset-itemid="crate-obj"src="crate.obj"></a-asset-item><a-asset-itemid="crate-mtl"src="crate.mtl"></a-asset-item></a-assets><!-- Using the asset management system. --><a-obj-modelsrc="#crate-obj"mtl="#crate-mtl"></a-obj-model><!-- Defining the URL inline. Not recommended but may be more comfortable. --><a-obj-modelsrc="crate.obj"mtl="crate.mtl"></a-obj-model></a-scene>